package com.suyang.syt.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginFilter implements Filter {
	@Override
	public void destroy() {

	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		Object object = request.getSession().getAttribute("loginUser");
		if ( object == null) {
			response.sendRedirect(request.getContextPath() + "/");
		} else {
			chain.doFilter(request, response);
		}
	}

	@Override
	public void init(FilterConfig ifg) throws ServletException {
	}

}
